
Commodore VIC-20 · BBC Microcomputer System · Dragon 32/64 · Commodore C64/128/MAX · ZX Spectrum · PC (Microsoft Windows) · Acorn Electron
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In this highly addictive top-down arcade shoot-em-up from 1982, originally for the ZX Spectrum, defend yourself from wave upon wave of deadly alien combatants using your Ion Thrust Drive and dual Plasma Disruptors.